WHY

@echo off & setlocal enabledelayedexpansion
for /f "delims=" %%i in (a.txt) do (
    if not "%%~i"==%%i (
        if %%~i#==%%i# (echo;!s!%%i) else set "s=%%i" 
    ) else echo;%%i
)
pause
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@if (0)==(0) echo off
cscript //nologo //e:jscript "%~0" < a.txt
pause & exit
@end
WSH.Echo(WSH.StdIn.ReadAll().replace(/([^"])\r\n/g, '$1'))
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WHY

@if (0)==(0) echo off
cscript //nologo //e:jscript "%~0" < a.txt > b.txt
pause & exit
@end

var s = WSH.StdIn.ReadAll().replace(
    /("[^"]*?)[\r\n]+([^"]*")/g,
    function(s0,s1,s2){if (s1+s2=='""'){return s0}else return s1+s2}
)
WSH.Echo(s)
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